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A garrison has sufficient provisions for 480 men for 12 days. If the number of men is reduced by 160; find how long will the provision last.



Garison has 12 days provision for 480 men 
but, no of men reduced by 160 
therefore, no. of men = 480-160=320
let no.of days be x 
so, using inverese variation
⇒x= 18 days
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